CN102795651A - Method for directly producing powdery calcium oxide from dicyandiamide waste residues - Google Patents
Method for directly producing powdery calcium oxide from dicyandiamide waste residues Download PDFInfo
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- CN102795651A CN102795651A CN2012103276372A CN201210327637A CN102795651A CN 102795651 A CN102795651 A CN 102795651A CN 2012103276372 A CN2012103276372 A CN 2012103276372A CN 201210327637 A CN201210327637 A CN 201210327637A CN 102795651 A CN102795651 A CN 102795651A
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- waste residues
- calcium oxide
- dicyandiamide
- low
- powdery calcium
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Abstract
The invention relates to a method for directly producing powdery calcium oxide from dicyandiamide waste residues. The method comprises the following steps of: conveying dicyandiamide waste residues to a rotary kiln, jetting pulverized coal, CO gas and air by using a three-channel burner arranged at the head of the kiln, and then jetting high-temperature flame for roasting. The method is characterized in that the powdery calcium oxide is produced through roasting by using the three-channel burner of the rotary kiln; the whole process does not need to dope anthracite; the waste residues are free of blank making; the finished calcium oxide does not need to be crashed; the production process is simple, low in cost, low in energy consumption and simple in process; recycling of the waste residues is realized; the environmental water source is protected from be polluted; and the produced product is low in weight, fine in particle, good in whiteness and obvious in economic benefit.
Description
Technical field
The invention belongs to the resource reutilization technical field, particularly relate to a kind of method of utilizing dicyandiamide sludge as material direct production powder quicklime.
Background technology
Dyhard RU 100 is a kind of industrial chemicals, pharmaceutically mainly is to produce " long-acting yellow amine ", is used for the Synergistic preparations of nitrogenous fertilizer on the agricultural.The dicyandiamide sludge as material major ingredient is quicklime (quicklime mainly exists with calcium carbonate form), and is comparatively similar with the Wingdale composition.In order to economize on resources, realize the utilization again of waste and old resource, available technology adopting dicyandiamide sludge as material fusion hard coal gets into the kiln calcining behind the base, and the block quicklime disintegrating process route of coming out of the stove is produced lime powder.This operational path is complicated, and base is too high with pulverizing link cost, and environmental pollution is big.
Summary of the invention
The objective of the invention is to overcome the defective of above-mentioned prior art, provide a kind of production technique simple, cost is low; It is little to consume energy; Reduce environmental pollution, realize waste and old resource reutilization, and the method for utilizing dicyandiamide sludge as material direct production powder quicklime of good product quality.
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
A kind of method of utilizing dicyandiamide sludge as material direct production powder quicklime is characterized in that: dicyandiamide sludge as material is transported to rotary kiln, and the triple channel burner coal injection, CO gas and the air that utilize kiln hood to be provided with spray into thermal-flame then and calcine.
700-900 ℃ of control calcining temperature.
The present invention adopts the calcining of rotary kiln triple channel burner to produce the powder quicklime, and whole technological process need not mixed hard coal, and waste residue does not need base, and the finished product quicklime does not need to pulverize; Production technique is simple, and cost is low, and power consumption is few, and technology is simple; Realized the recycling of waste residue, the protection environmental water systems is not contaminated, and the product physique of being produced is light; Particle is thin, and whiteness is good, remarkable in economical benefits.
Embodiment
Technical process of the present invention is for being: cyanamide waste residue (composition CaCO
3In) → the send into rotary kiln body → coal injection, CO gas, air combustion (being realized by the triple channel burner) → high-temperature calcination decompose lime carbonate (CaCO
3) → generate product quicklime (CaO) and dioxide gas (CO
2).
The staple of dicyandiamide sludge as material is: dry-powdered calcium carbonate content 86%, carbon dust 9%, other compositions 5%.Dicyandiamide sludge as material is dried the back naturally pass through conveyor delivery in rotary kiln; Kiln hood is provided with the triple channel burner; Feed calcium carbide stove exhaust (CO) and coal dust, air respectively; Through burner thermal-flame is blown in the kiln, waste residue is calcined under 700-900 ℃ of high temperature and is generated quicklime (CaO) and dioxide gas (CO
2), because of waste residue is Powdered, the quicklime of generation also is a pulverulence, and carbonic acid gas is used for company's cyanamide products production decalcifying agent, and quicklime is the calcium carbide raw materials for metallurgy.
The present invention has realized the comprehensive utilization of dicyandiamide sludge as material; Reduced pollution (the waste residue that at present most enterprise production Dyhard RU 100 produce of dicyandiamide sludge as material to environment; The dig pit mode of landfill of employing is handled, not only contaminate environment but also increased the transportation cost of transhipment waste residue).
Claims (2)
1. a method of utilizing dicyandiamide sludge as material direct production powder quicklime is characterized in that: dicyandiamide sludge as material is transported to rotary kiln, utilizes triple channel burner coal injection, CO gas and the air of kiln hood setting, spray into thermal-flame then and calcine.
2. according to the described method of utilizing dicyandiamide sludge as material direct production powder quicklime of claim 1, it is characterized in that: 700-900 ℃ of control calcining temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103276372A CN102795651A (en) | 2012-09-07 | 2012-09-07 | Method for directly producing powdery calcium oxide from dicyandiamide waste residues |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103276372A CN102795651A (en) | 2012-09-07 | 2012-09-07 | Method for directly producing powdery calcium oxide from dicyandiamide waste residues |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102795651A true CN102795651A (en) | 2012-11-28 |
Family
ID=47194997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012103276372A Pending CN102795651A (en) | 2012-09-07 | 2012-09-07 | Method for directly producing powdery calcium oxide from dicyandiamide waste residues |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102795651A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105036796A (en) * | 2015-07-23 | 2015-11-11 | 宁夏中节能瑞泽新材料有限公司 | Load-bearing aerated concrete prepared by means of coal gangue and lime nitrogen hydrolysis waste and preparation method thereof |
| CN106012012A (en) * | 2016-05-31 | 2016-10-12 | 宁夏大学 | Method for preparing calcium carbonate whiskers from dicyandiamide waste residues |
| CN111573706A (en) * | 2020-05-24 | 2020-08-25 | 东阳市琰安建筑工程有限公司 | Dicyandiamide black slag resource utilization treatment process |
| CN114590809A (en) * | 2022-01-06 | 2022-06-07 | 北京科技大学 | Preparation of desulfurizer from cyanamide waste residue and carbide slag and recycling of CO2Method (2) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1045385A (en) * | 1989-03-06 | 1990-09-19 | 刘永林 | A kind of method of producing lime powder |
| CN1277164A (en) * | 2000-06-27 | 2000-12-20 | 曾求成 | Lime producing process utilizing dicyandiamide sludge as material |
| CN201462853U (en) * | 2009-09-16 | 2010-05-12 | 新兴铸管股份有限公司 | Combustion nozzle used in lime rotary kiln |
| DE102010019330A1 (en) * | 2010-05-05 | 2011-11-10 | Ecoloop Gmbh | Process for the conversion of carbonates into oxides |
-
2012
- 2012-09-07 CN CN2012103276372A patent/CN102795651A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1045385A (en) * | 1989-03-06 | 1990-09-19 | 刘永林 | A kind of method of producing lime powder |
| CN1277164A (en) * | 2000-06-27 | 2000-12-20 | 曾求成 | Lime producing process utilizing dicyandiamide sludge as material |
| CN201462853U (en) * | 2009-09-16 | 2010-05-12 | 新兴铸管股份有限公司 | Combustion nozzle used in lime rotary kiln |
| DE102010019330A1 (en) * | 2010-05-05 | 2011-11-10 | Ecoloop Gmbh | Process for the conversion of carbonates into oxides |
Non-Patent Citations (1)
| Title |
|---|
| 宣春生等: "《沉淀法处理双氰胺厂废渣的研究》", 《太原工业大学学报》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105036796A (en) * | 2015-07-23 | 2015-11-11 | 宁夏中节能瑞泽新材料有限公司 | Load-bearing aerated concrete prepared by means of coal gangue and lime nitrogen hydrolysis waste and preparation method thereof |
| CN106012012A (en) * | 2016-05-31 | 2016-10-12 | 宁夏大学 | Method for preparing calcium carbonate whiskers from dicyandiamide waste residues |
| CN106012012B (en) * | 2016-05-31 | 2018-10-23 | 宁夏大学 | The method for preparing calcium carbonate crystal whisker with dicyandiamide sludge as material |
| CN111573706A (en) * | 2020-05-24 | 2020-08-25 | 东阳市琰安建筑工程有限公司 | Dicyandiamide black slag resource utilization treatment process |
| CN114590809A (en) * | 2022-01-06 | 2022-06-07 | 北京科技大学 | Preparation of desulfurizer from cyanamide waste residue and carbide slag and recycling of CO2Method (2) |
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Application publication date: 20121128 |